>> "Yjgent" <yjgent at aol.com> wrote in message
> news:20000526213618.02915.00000277 at ng-fz1.aol.com...> > >In this lab we're working with E.Coli (ATCC 25922 and wild type) and we
> > >routinely use MacConkey Agar inclusion plating as a counting method for
> > >these microorganisms.
> > I was taught a long time ago NOT to measure a colony count from a Mac
> > Only a non selective agar like TSA or a Blood Agar plate can be used to
> > colonies.
> > John Gentile M(ASCP) President - Rhode Island Apple
> > yjgent at aol.com> > Microbiologists do it with culture.
> Depends on the formulation and what you are trying to count.
> For years we used a MacConkey that surpressed gram - positives combined with
> a blood agar for urine.
> You can use Mac for water counts, though not recommended
Why is it not recommended for water counts, what would be more suitable?